MX3500N SELF DIAG AND TROUBLE CODE 8 – 22
H3-00 Fusing section high temperature
trouble (TH_UM)
H3-01 Fusing section high temperature trou-
ble (TH_LM)
H3-02 Sub thermistor fusing section high
temperature trouble (TH_US)
H3-04 Fusing section high temperature
trouble (TH_US)
H4-00 Fusing section low temperature
trouble (TH_UM_AD2)
H4-01 Fusing section low temperature
trouble (TH_LM)
Trouble content The fusing temperature inside the PWB exceeds the
specified level.
Section PCU
Case 1 Cause Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power source
trouble
Check
and
remedy
1) Use SIM5-2 to check blinking of the heater lamp.
2) If it blinks normally, check the thermistor and the
harness.
Check the control PWB thermistor input circuit
section.
3) If the heater lamp keep lighting, check the AC
PWB and the control PWB lamp control circuit.
4) Use SIM14 to cancel the trouble.
Trouble content The fusing temperature inside the PWB exceeds the
specified level.
Section PCU
Case 1 Cause Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power source
trouble
Check
and
remedy
1) Use SIM5-2 to check blinking of the heater lamp.
2) If it blinks normally, check the thermistor and the
harness.
Check the control PWB thermistor input circuit
section.
3) If the heater lamp keep lighting, check the AC
PWB and the control PWB lamp control circuit.
4) Use SIM14 to cancel the trouble.
Trouble content The fusing temperature inside the PWB exceeds the
specified level.
Section PCU
Case 1 Cause Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power source
trouble
Check
and
remedy
1) Use SIM5-2 to check blinking of the heater lamp.
2) If it blinks normally, check the thermistor and the
harness.
Check the control PWB thermistor input circuit
section.
3) If the heater lamp keep lighting, check the AC
PWB and the control PWB lamp control circuit.
4) Use SIM14 to cancel the trouble.
Trouble content The temperature of the hung-up prevention thermistor
exceeds the specified level.
Section PCU
Case 1 Cause Non-contact thermistor trouble, control PWB trouble,
fusing section connector connection error, AC power
source trouble
Check
and
remedy
1) Use Sim44-14 to check if the non-contact
thermistor shows an abnormal temperature. If
the display is normal, use Sim5-2 to check the
blinking operation of the heater lamp.
a) If it blinks normally, check the thermistor
and the harness.
Check the control PWB thermistor input
circuit section.
b) If the heater lamp keep lighting, check the
AC PWB and the control PWB lamp control
circuit.
2) Use SIM14 to cancel the trouble.
Trouble content The temperature does not reach the specified level
within the specified time after turning on the power
relay.
Section PCU
Case 1 Cause Thermistor trouble, heater lamp trouble, PCU PWB
trouble, thermostat trouble, AC power source trouble,
interlock switch trouble
Check
and
remedy
1) Use SIM5-2 to check blinking of the heater lamp.
2) If it blinks normally, check the thermistor and the
harness.
Check the control PWB thermistor input circuit
section.
3) If it is not lighted, check for the heater lamp
disconnection and the thermostat breakage.
Check the interlock switch. Check the AC PWB
and the PCU PWB lamp control circuit.
4) Use SIM14 to cancel the trouble.
Trouble content The temperature does not reach the specified level
within the specified time after turning on the power
relay.
Section PCU
Case 1 Cause Thermistor trouble, heater lamp trouble, PCU PWB
trouble, thermostat trouble, AC power source trouble,
interlock switch trouble
Check
and
remedy
1) Use SIM5-2 to check blinking of the heater lamp.
2) If it blinks normally, check the thermistor and the
harness.
Check the control PWB thermistor input circuit
section.
3) If it is not lighted, check for the heater lamp
disconnection and the thermostat breakage.
Check the interlock switch. Check the AC PWB
and the PCU PWB lamp control circuit.
4) Use SIM14 to cancel the trouble.
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